Surrounding world (Umwelt), 57-58, 58fn (“surroundings”), 65-66, 70-72, 75, 79-80, 82-83, 89, 101, 104-107, 112-133, 117, 126, 136, 158, 172, 209, 239, 300, 334, 342, 349, 352, 354, 356, 359, 361-362, 413, 416. See also public (world); with-world; work-world; world (BT)